Plants solitary at first, later forming clumps of as many as 30 stems. Stems cylindrical, tapered toward the tips, light green, to 20 cm (7.9 in) long and 5 cm (2 in) in diameter. Ribs 1519, low, acute, somewhat tuberculate. Spines whitish with dark tips. Central spines usually 3, lower ones longest, to 10 mm (0.4 in). Radial spines 22-24, lying against the surface, to 10 mm (0.4 in) long. Flowers borne near the stem tips, funnelform, pink, 3.8-8.5 cm (1.5-3.3 in) long, 5.5-10.5 cm (2.2-4.2 in) in diameter. Fruits subglobose, brownish, opening at the tip. Distribution: Sonora, Mexico.
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